Carbon Nanotubes Show Promise for Solar Cells, Other Devices

August 24, 2005

GE Global Research announced a breakthrough on August 18th that could lead
to a new generation of solar cells, as well as a wide variety of
electronic devices. The organization, which is the central research
arm of General Electric Company, has developed a diode from carbon
nanotubes—tubes of carbon on the scale of about a billionth of a
meter—that operates at the best possible performance for diodes,
the theoretical limit. The diode is also able to convert sunlight into
electricity, which means it could be used to build a solar cell.
Diodes are the fundamental building block for many electronic devices,
including solar cells, transistors, computer chips, sensors, and
light-emitting diodes (LEDs), so an ideal diode could result in a wide
variety of more efficient devices. GE published the research in the
August 15th issue of Applied Physical Letters. See the
GE press release.

One problem with nanotubes is the difficulty of assembling these sub-microscopic materials into a usable product, a barrier that
researchers at the University of Texas at Dallas (UTD) claim to have
overcome. In research published in the August 19th issue of Science,
the UTD researchers claim to be able to fabricate sheets of nanotubes
at a rate of seven meters per minute. The resulting sheets have a
number of amazing properties: they are transparent, extremely
lightweight, highly conductive, and stronger than steel. The research
team believes the sheets could have applications in either LEDs or
solar cells, as well a wide variety of other applications. The UTD
research was performed in collaboration with an Australian national
laboratory, the Commonwealth Scientific and Industrial Research
Organization (CSIRO). See the
UTD press release.